Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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PCT/AU2006/001928
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INTEGRATED JOINER
FIELD OF THE INVENTION
The present invention relates to a joiner or joining assembly for use in
joining
one article to another.
DESCRIPTION OF THE PRIOR ART
Joiners and joining assemblies used to securely fasten countertops and other
large panel items are known. For example, WO 03/035992 describes a novel
joiner arrangement that is capable of providing the required fastening forces
to
provide a clamping effect between the joined articles. There is however known
in to be a number of considerable difficulties in applying equivalent
clamping
forces to articles that do not have the same surface area as that of a flat
bench
top, such as chairs, tables and other such furniture in which the clamping
means has to be integrated within the structural member, be it an arm of a
chair
or the leg of a bed to its frame. Such joining is required most often in what
is
referred to as "flat-pack" or "knock-down" furniture, in which the furniture
is
provided to the end consumer in a disassembled arrangement, thus requiring
some limited assembly by the purchaser. The joiners typically used in such
"flat-pack" applications are connectors that either employ a traditional hex
head
fastener that has to be tightened by using an open ended spanner or an Allen
key connector.
The hex head connector is particularly complicated for users in that due to
the
restrictive opening within which the hex head is located only allows for
limited
movement of the hex head by the open ended spanner such that with each turn
of the open ended spanner the hex head is rotated only a small distance of its
diameter and so requires substantial turning to effect proper tightening and
clamping. This can take significant time and cause considerable frustration to
the person assembling the item. In addition, the smaller the size of the
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connector and the accompanying hex head, the smaller then will be the access
hole for the open ended spanner. This limitation of size then impacts upon the
conditions in which such connections can be employed successfully.
Other types of commonly used connecting bolts for "fiat-pack applications or
other situations requiring the joining of two articles, employs connectors
having
either a cam arrangement or an Alien key operated tightening assembly. There
are known to be certain deficiencies with each of these types of connectors
including the narrow range of clamping forces provided arKi the complexity in
initial fitting of the components into the furniture or articles to be joined
together.
It is has now been found by the present inventor that an improved joiner and
joining assembly can be provided in which the joiner is capable of being of a
relatively small size compared to that currently available so that it can be
utilised in many different applications and provides for an ease of assembly
and
use.
OBJECT OF THE INVENTION
It is an object of the present invention to provide a joiner that is
relatively small
in size and is convenient to install.
Another object of the invention is to provide a joiner that is capable of
applying
clamping forces to the articles to be joined.
it is an object of the present invention to overcome, or at least
substantially
ameliorate, the disadvantages and shortcomings of the prior art,
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Other objects and advantages of the present invention will become apparent
from the following description, taking in c.onnection with the accompanying
drawings, wherein, by way of illustration and example, an embodiment of the
present invention is disclosed.
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SUMMARY OF THE INVENTION
According to the present invention, although this should not be seen as
limiting
the invention in any way, there is provided a joiner including at least one
engaging member, a screw threaded shaft passing through the engaging
member, at least one nut threadably engaging the shaft, a first gear member
adapted to receive the screw threaded shaft, a second gear member captivity
held within a slot within the engaging member and positioned to interengage
with the first gear member and having a tool engaging means, both the first
.
gear member and second gear member being located substantially within the
engaging member whereby a turning of the second gear facilitates a tightening
of the joiner and wherein the at least one engaging member further includes at
least one securing means to captively hold the first gear member to allow
rotation thereof.
With the engaging member securing the first gear by a securing means that
allows rotation of the first gear, this then also holds the second gear in
place so
as to also allow relative rotation of the second gear within the engaging
member.
In preference, the first and second gears are spur gears.
In preference, the second gear holds the first gear in place within the slot.
In preference, the securing means on the engaging member is a slot adapted to
receive the first gear member.
In preference, the slot is integral with the engaging member.
In preference, the securing means is a retaining member positioned on the
engaging member.
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In preference, the retaining member projects into a recess adapted to or
shaped
to receive the first gear and upon insertion of the first gear into the first
gear
recess, the retaining member will hold the first gear in place so as to allow
rotation of the first gear.
In preference, the second gear is located in a second gear recess.
In preference, the engaging member has an aperture thereon substantially
perpendicular to the tool engaging means of the second gear member so as to
allow access to the tool engaging means.
In preference, the tool engaging means is an aperture shaped to receive a tool
to bit.
In preference, the teeth profile of the first and second gear members is
rounded
so as to provide a point to point contact between the first and second gears.
In preference, the tooth face of the first and second gears is a spherical
surface.
In preference, the tooth face of the first and second gear members is a
is spherical segment,
In preference, the tooth face is a concave section.
In preference, the tool engaging means is an aperture shaped to receive an
Allen key.
In preference, the first gear member has a periphety flange.
29 In preference, the first gear member has a hUb extension..
In preference, the hub extension has a face that abuts at least a section of
the
first gear member recess in the engaging member.
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In preference, the first and second gear members are made from a composite
plastic/glass material.
In preference, the engaging member is arcuate shaped to nest within a cavity
within an article to be joined to another.
5 In preference, the first gear member has its teeth aligned so that they
are facing
in the direction of the body of the shaft.
BRIEF DESCRIPTION OF THE DRAWINGS.
By way of example, an employment of the invention is described more fully
hereinafter with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of a joiner according to a first embodiment of
the
invention,
Figure 2 is a side sectional view through BB in figure 1, showing the internal
gearing arrangement,
Figure 3 is a plan view of the joiner of figure 1,
Figure 4 is a side sectional view through C-C in figure 3,
Figure 5 is a perspective view of a first gear member,
Figure 6 is a perspective view of the second gear member,
Figure 7 is a side view of the second gear member,
Figure 8 is a side sectional view through D-D in figure 7,
Figure 9 is a perspective view of a joiner according to a second embodiment of
the invention,
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Figure 10 is a perspective view of the joiner of Figure 9 with the holding
means and first
gear member removed.
Figure 11 is a perspective view of the holding means that slots within the
joiner as shown
in Figure 10.
DETAILED DESCRIPTION OF THE INVENTION
The joiner 10 of figure 1 has an engaging member 12 being of a substantially
circular
shape about its diameter, a first gear member 15 located within a first recess
17 and a
second gear member I S located within a second recess 20.
The first gear member 15 has a frusto conical back end 22 and a face 24 with
teeth 26
positioned thereon. The hub 28 of the first gear member 15 extends beyond a
first tooth top
30 to give a hub extension 32. The hub 28 has an aperture 34 running there
through and the
internal face of the aperture 34 is screw threaded to receive a shaft.
For purposes of clarity, the shaft that engages with the aperture 34 is not
shown, but it
would be clear to those skilled in the art the shape and purpose of such a
shaft.
The first gear member 15 circumventral band 36 having beveled ends 38 and 40.
The
beveled end 40, adjacent to the face 24 is shaped to mirror substantially the
inner face 42
of the first recess 17. Additionally, the face 44 of hub extension 32 is
similarly shaped to
match the inner platform face 46 of the first recess 17.
In this way then the first gear member 15 is shaped so as to fit within the
first recess 17 in
a substantially complementary fashion such that the first gear member 15 is
still relatively
free to rotate about its axis 48.
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The second gear member 19 has an aperture 50 for receiving a tip of a tool of
complimentary shape. The face 52 of the second gear member 19 has teeth 54
thereon and the circumferential band 56 of the second gear member 19 has a
beveled face 68 and an arcuate edge 60.
The teeth 54 of the second gear member 19 have a tooth face 62 that has a
spherical surface traveling substantially the first length of the addendum. As
.
can be seen in figure 7, for example, the resultant tooth face 62 has a
profile
that results in reduced or minimal contact of the tooth 54 with the inner face
70
of the second recess 20 and the hub face 64 of the hub 63 is approximately
parallel with the tooth top 64. In this manner then there is minimal friction
between the second gear member 19 and the inner face 70.
The first gear member 15 also has teeth 70 of a spherical shape. The teeth 70
extend from the gear face 24 and the hub 28 both in the plane of the gear axis
and the plane of rotational being the plane perpendicular to the gear axis 72.
In
is this manner then each tooth top 76 provides only a minimal contact area
to the
inner face 78 so that rotation of the first gear member 15 about its axis of
rotation provides minimal resistance. When this particular tooth shaped 70 is
compared to that of conventional gearing which typically has a flat top
surface
with a relatively sharp tooth chamfer, that being the level between the end of
the
tooth surface, this can then lead to the gear teeth digging into the inner
surface
78 that it is pushing against. By employing the substantially spherical shaped
teeth 70, substantial pressure can still be applied by the first gear member
15
against the inner face 78 without significant reduction in performance.
Additionally, the first gear 15 has a hub extension 32 with a face 44 shaped
to
compliment the inner faced platform 46 of the first recess 17 so that again
any
pressure applied by the first gear member 15 to the first recess 17 will be
evenly
distributed across a larger surface area.
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The first gear member 15 also holds the second gear member 19 in place by
the urging of the teeth 26 of the first gear member 15 against the teeth 54 of
the
second gear member 19. What will of course be appreciated immediately by
those skilled in this particular art is that due to the particular shape of
both the
s first and second gear members respectively there will be a minimal
contact area
between each of the gear members. The joiner 10 further has a retaining tab
80, that is suitably flexible to allow insertion of the first gear member 15
into the
first recess 17 thus forcing the retaining tab 80 away from the first recess
17
such that the retaining tabs 80 ride over the beveled end 40 and the
io circumventral band 36 to then hold the first gear 15 in place. This then
of
course holds the second gear member 19 in place.
Upon a tightening of the joiner 10 a tool tip Is placed within the aperture 82
of
the engaging member 12 so that the tool tip is able to fit snug* within the
aperture 50 of the first gear member 19 so that when the tool tip is rotated
the
16 second gear member 19 also rotates and the gear teeth 54 of the second
gear
member mesh and interact with the teeth 26 of the first gear member 15 to
effect the rotation of the first gear member 15 about axis 48 to effect a
tightening of an engaged shaft passing through the hub 28. The aperture 50
could be shaped to receive any conventional drive head such as a Philips head
20 or flat headed screw driver but perhaps most useful is an Men key shape.
In an alternative embodiment as shown in figure 9, the second gear member is
held in place by insertion of the second gear member 100 into a slot 105 that
secures the second gear member 100 whilst still allowing it to rotate about
its
axis. The slot 105 is shaped to provide a nesting fit of the second gear
member
25 100 and may be eittler integral with the engaging member 101 or formed
as a
separate part that is inserted itself into the engaging member 101.
The retaining means 102 has inclined inner surfaces 107 and 109 shaped to
compliment the fnisto conical shaped face of the back end 22 of the first gear
member 15. Figure 10 shows the joiner with the retaining section 102 removed.
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The extending members 115 nest within the complimentary shaped openings
120 to captivity hold the first gear member In place, the inner surface 125 of
102
so shaped to contour that of the back end 22 of the first gear member 100.
Accordingly, a threaded shaft can be Inserted into the first gear member 100
so
as to engage such. The other end of the treaded shaft can be either fitted
with a
nut or can be affixed to a section of furniture to be joined thereto, such
that the
first joining element is in a separate section of furniture. Then, once
engaged,
the first gear member can be rotated by relative rotation of the second gear
member by rotating a suitable shaped tool tip inserted in the aperture within
the
second gear member so as to effect a tightening of the joiner.
Other mounting methods for the first gear member may be utilized other than
those mentioned here, without necessarily departing from the scope of the
Invention.
The joiner 10 is constructed from a suitably resilient material, preferably
being a
glass/plastics composite tolerable of forces and pressures appropriate to
manufacturing industries, such as furniture construction, using techniques
such
as metal injection moulding (MIM), or cast molding so as to produce such
intricate, relatively miniature, gear shapes and angles.
From the above then it is clear to see that the current invention now provides
for
a joiner 10 that can be made in a neat compact shape suitable for use in a
number of industries where end to end joining is required, such as flat-pack
furniture, and that a user can quickly and effectively tighten the joiner 10
by use
of standard, conventional tool Shapes, such as an Allen key either manually or
by power tool. Thin then resufts in a greater reduced time and effort of
construction whilst providing high clamping forces,
Although the invention has been herein shown and described in what is
conceived to be the most practical and preferred embodiment, it is recognized
that departures can be made within the scope of the invention, which is not to
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be limited to the details described herein but it is to be accorded the full
scope
of the appended claims so as to embrace any and all equivalent devices and
apparatus,
